How do I calculate and fly a wind-correction angle?

A wind-correction angle (WCA) is the number of degrees you steer into the wind so the aircraft follows the desired ground track. For Aviation & Real-World Flying, calculate the wind’s cross-track component, divide it by true airspeed, take the inverse sine, then turn the resulting number of degrees towards the wind.

How do I calculate a wind-correction angle?

Use the wind triangle to find the heading that cancels the wind’s sideways movement across your intended track.

1. Use one directional reference. Desired track and wind direction must both be true or both be magnetic.
2. Find the relative wind angle. Subtract the desired track from the wind-from direction, then normalise the result to between −180° and +180°.
3. Calculate the crosswind component. Use crosswind = wind speed × sin(relative wind angle).
4. Calculate the WCA. Use WCA = asin(crosswind ÷ true airspeed). Put the calculator in degree mode.
5. Apply the correction towards the wind. Add a positive WCA to the desired track or subtract a negative one. Wrap headings through 360°, so 355° plus 10° becomes 005°.

The complete signed formula is WCA = asin[(wind speed ÷ TAS) × sin(wind-from direction − desired track)]. A positive result is a clockwise or right correction; a negative result is a left correction.

For a quick estimate when the correction is small, use WCA ≈ 60 × crosswind ÷ TAS. The exact inverse-sine calculation is preferable when the wind is strong or the aircraft is slow. If the crosswind component exceeds TAS, no heading can maintain that ground track.

Worked wind-correction angle example

For a desired true track of 090°, wind from 150° at 20 knots and a TAS of 100 knots, the required true heading is approximately 100°.

1. Relative wind angle: 150° − 090° = 60°. The wind is from the right.
2. Crosswind component: 20 × sin(60°) = 17.3 knots.
3. Wind-correction angle: asin(17.3 ÷ 100) = 10°.
4. Corrected heading: 090° + 10° = 100° true.

The estimated groundspeed is about 89 knots: roughly 98.5 knots of TAS remains along the track after crabbing, reduced by the 10-knot headwind component.

Which wind and airspeed should I use?

Use the forecast or observed wind at the aircraft’s planned altitude and position, together with true airspeed, not indicated airspeed or groundspeed.

A surface observation may be suitable near an aerodrome but not for an en-route calculation several thousand feet higher. Our explanation of decoding wind direction and speed in a METAR covers the surface wind group and its units.

METAR and winds-aloft directions are normally referenced to true north, while VOR courses and many cockpit indications are magnetic. Convert one before doing the calculation; do not mix them. When converting true to magnetic, subtract easterly variation and add westerly variation, then account for compass deviation if flying by magnetic compass.

A mistake we see constantly is using groundspeed in the WCA formula. Groundspeed is an output of the wind triangle, so feeding it back into the calculation produces the wrong correction. In a simulator, also allow for weather interpolation, gusts and changes between forecast layers—the displayed wind may not exactly match the value used during planning.

How do I fly the calculated WCA?

Fly the corrected heading in coordinated, approximately wings-level flight, then monitor the resulting ground track and refine the heading as the real wind reveals itself.

1. Intercept the planned route first. WCA maintains a track; it does not automatically return an aircraft that is already displaced from it.
2. Set the corrected heading. Use the heading indicator or heading bug and hold normal coordinated flight. WCA is a heading offset, not a bank angle or fixed rudder input.
3. Check the ground track. Compare the GNSS track, moving-map line, radio-navigation indication or ground references with the desired course. Allow the indication time to settle.
4. Adjust towards the required track. If the aircraft continues drifting right, increase the left correction; if it drifts left, correct right. One- or two-degree changes are usually easier to assess than chasing every fluctuation.
5. Recalculate when conditions change. A new track, altitude, TAS or wind requires a new correction.

If the aircraft is off course, add an intercept angle so its ground track points back towards the route. Once the course is recaptured, remove the intercept angle but retain the maintenance WCA. Confusing these two angles is why pilots often overshoot and then chase a CDI from side to side.

Why does the calculated WCA fail to hold the course?

A calculated WCA usually fails because the inputs or directional references are wrong, not because the wind-triangle method is wrong.

• Wind direction was treated as wind-to. Aviation reports where the wind comes from, so wind 270° blows from west towards east.
• True and magnetic directions were mixed. This can introduce an error comparable to, or larger than, the WCA itself.
• IAS or groundspeed replaced TAS. The formula requires the aircraft’s speed through the air mass.
• Surface wind was used at cruising altitude. Wind direction and speed can change substantially with height.
• Heading was mistaken for track. The corrected heading should point into wind; the resulting ground track should match the planned course.
• The aircraft was already off route. Use an intercept angle to regain the route before settling on the maintenance correction.

Does the same WCA apply in the circuit and on landing?

No. Each circuit leg has a different desired ground track, so its wind-correction angle must change as the aircraft turns. Our guide to holding the correct ground track around a traffic pattern shows how those changing corrections fit together.

On final, the crab angle that keeps the aircraft over the extended centreline is effectively a live wind correction. Before touchdown, the pilot may de-crab or transition to a wing-low sideslip according to the aircraft and operating procedure; our crosswind landing technique explanation covers that separate control problem. Do not treat an en-route WCA as a fixed rudder or aileron setting for touchdown.